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Title
CERTIFICATE
DECLARATION
ACKNOWLEDGEMENT
CONTENTS
1. Introduction
1.1 β-OXODITHIOCARBOXYLATES
1.2 REACTIONS OF β-OXODITHIOESTERS WITH α-HALOKETONES SYNTHESIS OF SUBSTITUTED1, 3-OXATHIOLES AND THIOPHENES
1.3 FUNCTIONALIZED KETENEDITHIOACETALS FROM β-OXODITHIOESTERS APPLICATIONS IN THE SYNTHESIS OF THIOPHENE DERIVATIVES AND SUBSTITUTED1, 3-DITHIAFULVENES
1.4 REACTIONS OF SUBSTITUTED 2-YLIDENE-1, 3-DITHIOLANES WITH DISMAL ANION
1.5 REACTION OF- ARYLETHYLEDENEMALONONITRILES WITH DIMETHYL TRITHIOCARBONATE SYNTHESIS OF SUBSTITUTED THIOPYRAN-2-ONES
1.6 REFERENCES
2. Functionalized Dithioesters: an Overview
2.1 INTRODUCTION
2.2 DITHIOCARBOXYLIC ACIDS AND ESTERS: SYNTHESIS
2.2.1 Synthesis of β-Oxodithiocarboxylic Acids and Esters
2.2.1.1 Synthesis of β-Oxodithiocarboxylates from α-Oxoketenedithioacetals
2.2.2 Synthesis of α, β-Unsaturated Dithiocarboxylates
2.2.3 Synthesis of α-Oxodithiocarboxylates
2.3 DITHIOCARBOXYLIC ACIDS AND ESTERS: REACTIONS
2.3.1 Reactions of β-Oxodithioesters
2.4 REFERENCES
3. Reactions of β-Oxodithioesters with α- Haloketones Synthesis of Substituted 1, 3-Oxathioles and Thiophenes
3.1 INTRODUCTION
3.2 SUBSTITUTED 1, 3-OXATHIOLES; SYNTHESIS
3.2.1 Synthesis of 1, 3-Oxathiole-2-ylidene Derivatives
3.3 RESULTS AND DISCUSSION
3.3.1 Reactions of β -Oxothioantides with Functionalized Electrophiles
3.3.2 Reactions of β-Oxodithioesters with Functionalized Electrophiles
3.3.3 Reactions of β-Oxodithioesters with α-Haloketones
3.3.4 Reactions of β-Oxodithioesters with Bromoacetone
3.3.5 Reactions of β-Oxodithioesters of α-Tetralone with Bromoacetone
3.4 CONCLUSIONS
3.5 EXPERIMENTAL
3.5.1 General Method for the Preparation of β-Oxodithioesters
3.5.2 Reactions of-Oxodithioesters 78 α-d with Phenacyl bromide
3.5.2.1 Formooon of FunctionaliaedKetenedithioacetals 91a-d and 92: General Procedure
3.5.2.2 Reactions of Aroyldithioacelals with Phenacyl bromide: Formation of Substituted Oxathioles.General Procedure
3.5.2.3 Reactions of Methyl - (3, 4-dihydro-1 (2H) -naphthalene) -2-carbodithioate with Phenacyl bromide
3.5 2.4 Reaction of Methyl cyclohexanone-2-carbodithioate with Phenacyl bromide
3.5.2.5 Reactions of aceryldithioester with phenacyl bromide
3.3.2.6 Reactions of β-Oxodihioesters with Bromoaeetone Formation of Substituted Thiophenes: General Procedure
3.6 REFERFNCES
4. Reactions of Functionalized Ketenedithioacetals Synthesis of Thiophene and Dithiafulvene Derivatives
4.1 INTRODUCTION
4.2 SYNTHESIS AND APPLICATIONS OF 1, 3-DITHIAFULVENES
4.3 RESULTS AND DISCUSSION
4.3.1 Thermal Cyclization of Functionalized Ketenedithioacetals Formation of Substituted Thiophenes
4.3.2 Reactions of Functionalized Ketenedithioacetals with Lawessons Reagent Formation of Substituted Thiophenes and Dithiafulvenes
4.4 CONCLUSIONS
4.5 EXPERIMENTAL
4.5.1 Synthesis of Thiophene Derivatives from Functionalized Ketenedithioacetals
4.5.2 Reactions of Functionalized Ketenedithioacetals with Lawessons Reagent Formation of Substituted Dithiafulvenes and Thiophenes
4.6 REFERENCES
5. Reactions of Substituted 2 ylidene-1, 3-dithiolanes with Dimsyl Anion
5.1 INTRODUCTION
5.2 REACTIONS OF DIMSYL ANION
5.3 RESULTS AND DISCUSSION
5.3.1 Synthesis of Substituted Cinnamoyl Ketenedithioacetals
5.3.2 Reactions of Substituted 2-ylidene-1, 3-dithiolanes with Dimsyl Anion Formation of Substituted 5, 6-Dihydrothiopyran-4-one Derivatives
5.3.3 Reactions of Substituted 2-ylidene-l, 3-dithiolanes with Dimsyl Anion Followed by Alkylation with Methyl iodide
5.3.4 Reaction of 2- (4-Methyl benzoylmethylene) -1, 3-dithiolane with Dimsyl Anion Followed by Alkylation with Phenacyl bromide
5.4 CONCLUSIONS
5.5 EXPERIMENTAL
5.5.1 Preparation of 2-Acetylmethylene-l, 3-dithioianes 30 and 33
5.5.2 Reaction of 2-Acetylmethylene-1, 3-dithiolane 30 with Substituted Benzaldehydes
5.5.3 Reactions of Cinnamoyl Ketenedithioacetals 32a-d and 34a-b with Dimsyl Action Formation of 5, 6-dihydnothiopyran-4-ones 37a-d and 38a-b: General Procedure
5.5.4 Reactions of 36a and 36b with Dimsyl Anion Formation of 5.6-Dihydrothiopyran--ones 40a and 40: General Procedure
5.5.5 Reactions of 1- (1, 3-Dithiolan-2-ylidene) -4-phenyl-3-butene-2-one 32a with Dimsyl Anion Followed by Alkylation with Methyl iodide
5.5.6 Reaction of 2- (4-Methyl benzoylmethylene) -1, 3-dithiolane 45 with Dimsyl Anion Followed by Alkylation with Phenacyl bromide
5.6 REFERENCES
6. Reactions of Arylethyledenemalononitriles with Dimethyl trithiocarbonate Synthesis of Substituted thiopyran-2-ones
6.1 INTRODUCTION
6.2 REACTIONS OF ARYLETHYLIDENEMALONONITRILES
6.3 RESULTS AND DISCUSSION
6.3.1 Synthesis of Substituted thiopyrones
6.4 CONCLUSIONS
6.5 EXPERIMENTAL
6.5.1 Reactions of 1-Dicyano-2-phenyl propene with trithiocarbonate General Procedure
6.6 REFERENCES