Disparlure(7R,8S)-环氧-2-甲基氧十二烷是吉普赛蛾的性信息素。据报道其最短的合成,对映体过量很高(> 99%)。此外,描述了将稳定的同位素标记掺入disparlure中,并通过2 H NMR研究了在男性吉普赛蛾的触角中发现的disparlure对映异构体与两种信息素结合蛋白之间的相互作用。
The vinylogous Mukaiyamaaldolreaction (VMAR) of chiral nonracemic ketene silyl N,O-acetal with various aldehydes is demonstrated. VMAR with α-heteroatom-unsubstituted aldehydes proceeded with a high degree of anti-selectivity. In sharp contrast, moderate to high syn-selectivity was observed when α-heteroatom-substituted aldehydes were used.
The cis- and trans-C12 enol ether lipids, 3-[(E and Z)-1-dodecenyloxyl]-1,2-propanediol (1a) and (1b), were prepared using a novel enol ether synthesis.
Carbene and Acid Cooperative Catalytic Reactions of Aldehydes and <i>o</i>-Hydroxybenzhydryl Amines for Highly Enantioselective Access to Dihydrocoumarins
作者:Xingkuan Chen、Runjiang Song、Yingguo Liu、Chong Yih Ooi、Zhichao Jin、Tingshun Zhu、Hongling Wang、Lin Hao、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b02883
日期:2017.11.3
A highly enantioselective method for quick access to dihydrocoumarins is reported. The reaction involves a cooperative catalytic process with carbene and in situ generated Brønsted acid as the catalysts. α-Chloro aldehyde and readily available and stable o-hydroxybenzhydryl amine substrates were used to generate reactive azolium ester enolate and ortho-quinone methide (o-QM) intermediates, respectively
Chiral NHC-Catalyzed Oxodiene Diels−Alder Reactions with α-Chloroaldehyde Bisulfite Salts
作者:Ming He、Brendan J. Beahm、Jeffrey W. Bode
DOI:10.1021/ol801502h
日期:2008.9.1
hetero-Diels-Alder reactions with various oxodienes under biphasic reaction conditions with high levels of enantioselectivity. This new protocol makes possible enantioselective additions fromcommerciallyavailablechloroacetaldehyde sodium bisulfite and demonstrates that this unique class of catalysts readily tolerates aqueous conditions.
Synthesis of Z-allylsilanes in high or good yields and with good stereoselectivity is achieved from O-acetylated 1-silyl-3-chloro alcohols promoted by SmI2. The starting compounds were easily prepared from 2-chloroaldehydes and a mechanism is proposed to explain the stereoselectivity of the β-elimination reaction.