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- W3165291230 abstract "Abstract The novel enantiopure synthesis of protected proline‐cysteine analogs by means of 1,3‐dipolar cycloaddition of homochiral thiazolines and azomethine ylides is described. The important role of the oxidation state of the sulfur atom of the dipolarophile in such reaction is demonstrated affecting strongly the regioselectivity and reactivity of the 1,3‐dipolar cycloaddition. Mono‐oxidized sulfur atom (sulfoxide group) and di‐oxidized (sulfone group) led to 2,3 regio‐addition whereas reactions starting from non‐oxidized sulfur atom resulted in the 2,4 addition. Besides, sulfur oxidized thiazolines reacted smoothly upon heating in an organic solvent media but the non‐oxidized sulfur thiazoline required metal catalysis. Diastereofacial selectivity was observed to be independent of the oxidation state of the sulfur atom but controlled by the bulky tert ‐butyl group at the thiazoline ring. The highly substituted and functionalized enantiopure pyrrolidine‐thiazolidine bicyclic compounds are considered as novel (homo)cysteine‐proline analogs with important properties to discover." @default.
- W3165291230 created "2021-06-07" @default.
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- W3165291230 date "2021-05-26" @default.
- W3165291230 modified "2023-10-17" @default.
- W3165291230 title "The Crucial Role of <i>S</i>‐oxidation State on the Selectivity and Reaction Rate of the 1,3‐Dipolar Cycloaddition of Azomethine Ylides and Homochiral Thiazolines" @default.
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- W3165291230 doi "https://doi.org/10.1002/ejoc.202100237" @default.
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