Reduction of .BETA.-Ketoalkyl 2-(1-Dimethylaminoethyl)phenyl Sulfoxides: Synthesis of (-)-Matsutakeol.
作者:Makoto SHIMAZAKI、Norie ICHIHARA、Mikiko GOTO、Akihiro OHTA
DOI:10.1248/cpb.40.3072
日期:——
Five β-ketoalkyl 2-(1-dimethylaminoethyl)phenyl sulfoxides (2a-e) were prepared by lithiation at the α-methyl hydrogen to the sulfoxide group of N, N-dimethyl-1-(2-methylsulfinylphenyl)ethylamine (1), followed by condensation with esters. The reduction of 2a-e gave two kinds of β-hydroxysulfoxides (3a-e and 4a-e), whose structures were determined by transforming 4a to naturally occurring (-)-matsutakeol. The results on the diastereoselectivity of this reduction and the 1H-NMR spectral behavior of the α-hydrogens to the sulfoxide group were different from those found in the case of reduction of β-ketoalkyl tolyl sulfoxides.
五种β-酮烷基-2-(1-二甲氨乙基)苯基亚磺氧化物(2a-e)是通过对N,N-二甲基-1-(2-甲基亚磺酰基苯基)乙胺(1)进行α-甲基氢的锂化,然后与酯缩合反应制备而成的。对2a-e的还原产生了两种β-羟基亚磺氧化物(3a-e和4a-e),其结构通过将4a转化为天然存在的(-)-松茸酚来确定。该还原反应的非对映选择性结果以及α-氢对亚磺氧化物基团的1H-NMR光谱行为与β-酮烷基噻吩亚磺氧化物的还原情况有所不同。