Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 20, Pages 11414-11422Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100497
Keywords
arylation; hypervalent iodine; Morita– Baylis– Hillman reaction; rearrangement; vinylation
Categories
Funding
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials at Zhejiang Normal University [NSFC-22071219]
- Natural Science Foundation of Zhejiang Province [LR20B020001]
- [NSFC-21773240]
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This study demonstrates the reversal of stereoselectivity in MBH-type [3,3]-rearrangement by using a new pair of rearrangement partners, leading to the synthesis of different types of alpha-aryl alpha,beta-unsaturated carbonyl derivatives. Mechanistic studies provide insights into the reaction pathway and the opposite stereoselectivities observed.
alpha-aryl alpha,beta-unsaturated carbonyls represent an important class of derivatizable synthetic intermediates, however, the synthesis of such compounds still remains a challenge. Recently, we showcased a novel Z-selective alpha-arylation of alpha,beta-unsaturated nitriles with aryl sulfoxides via [3,3]-rearrangement involving an Morita-Baylis-Hillman (MBH) process. Herein, we demonstrate the feasibility of reversing the stereoselectivity of such MBH-type [3,3]-rearrangement by switching to a new pair of rearrangement partners consisting of aryl iodanes and alpha,beta-unsaturated oxazolines. As a result, the two protocols complement each other in approaching E- or Z-alpha-aryl alpha,beta-unsaturated carbonyl derivatives. Mechanistic studies reveal a possible reaction pathway and provide an explanation for the opposite stereoselectivities.
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