Diastereoselective Synthesis of Protected 1,3-Diols by Catalytic Diol Relocation
摘要:
A complementary diastereoselective gold(I) or bismuth(III) catalyzed tandem hemiacetalization/dehydrative cyclization of 1,5-monoallylic diols was developed to access 1,3-dioxolanes and dioxanes. This methodology provides rapid access to protected 1,3-diols under mild conditions with high levels of diastereoselectivity.
Diastereoselective Synthesis of Protected 1,3-Diols by Catalytic Diol Relocation
作者:Justin A. Goodwin、Carl F. Ballesteros、Aaron Aponick
DOI:10.1021/acs.orglett.5b02725
日期:2015.11.20
A complementary diastereoselective gold(I) or bismuth(III) catalyzed tandem hemiacetalization/dehydrative cyclization of 1,5-monoallylic diols was developed to access 1,3-dioxolanes and dioxanes. This methodology provides rapid access to protected 1,3-diols under mild conditions with high levels of diastereoselectivity.
Preparation of (
<i>Z</i>
)‐Alk‐2‐ene‐1,5‐diols by the Titanocene(II)‐Promoted Cyclization of Thioacetals Possessing a Terminal Carbon−Carbon Double Bond
Titanocene(II)-promoted ring-closing metathesis of the titanium carbene complexes prepared from [2,2-bis(phenylthio)ethyl](but-3-enyloxy)dimethylsilanes or dimethyl(prop-2-enyl)silyl ethers of 3,3-bis(phenythio)propanols gave seven-membered cyclic unsaturated silyl ethers. Oxidative cleavage of a silicon−carbon bond of the cyclic silyl ethers resulted in olefinic diols, with high Z stereoselectivity.