A Short and General Approach to the Synthesis of Styryllactones:(+)-Goniodiol, its Acetates and β-Trifluoromethyl Derivative, (+)-7-<i>epi</i>-Goniodiol and (+)-9-Deoxygoniopypyrone
作者:Guo-Qiang Lin、Jian Chen、Zhi-Min Wang、Han-Quan Liu
DOI:10.1055/s-2002-32977
日期:——
(+)-Goniodiol, its acetates and β-trifluoromethyl derivative, (+)-7-epi-Goniodiol and (+)-9-deoxygoniopypyrone, the representatives of styryllactones have been synthesized in a short and general way. The key steps involve the regioselective asymmetric dihydroxylation and the palladium-catalyzed cross-coupling of cyclic allylic carbonate with vinyltributylstannane.
Fermenting baker's yeast converts alpha-bromo substituted enones 7 and 10 into enantiomerically pure (1S,2R)2-bromoindan-1-ol 3 and (2S,3S)-3-bromo-4-phenylbutan-2-ol 11, respectively, through the intermediacy of the corresponding saturated ketones. Structurally related 16 provides the (2R)-allylic alcohol 17 prevalently. (C) 1998 Elsevier Science Ltd. All rights reserved.
Asymmetric Diboration of Terminal Alkenes with a Rhodium Catalyst and Subsequent Oxidation: Enantioselective Synthesis of Optically Active 1,2-Diols
作者:Kenji Toribatake、Hisao Nishiyama
DOI:10.1002/anie.201305181
日期:2013.10.11
Pin it down: A highly enantioselective diboration of terminal alkenes with chiral 1 and bis(pinacolato)diboron (B2pin2) was realized. Subsequent oxidation of the diboron adducts with sodium peroxoborate readily gave the corresponding opticallyactive 1,2‐diols in high yields and high enantioselectivities.
Enantioselective N‐Heterocyclic Carbene Catalyzed α‐Oxidative Coupling of Enals with Carboxylic Acids Using an Iodine(III) Reagent
作者:Yuan‐Yuan Xu、Zhong‐Hua Gao、Cao‐Bo Li、Song Ye
DOI:10.1002/anie.202218362
日期:2023.3.6
with an iodine(III) reagent was developed to enable enantioselective α-oxidative coupling of enals with carboxylic acids, affording α-acyloxyl-β,γ-unsaturated esters in good yields with high regio- and enantioselectivities. The key step involves the formation of an enol iodine(III) intermediate, which changes the polarity of α-carbon of the enal from nucleophilic to electrophilic.