Asymmetric dihydroxylation of linalool, nerolidol and citronellyl acetate. Enantioselective synthesis of (3S, 6S)-tetrahydro-2,2,6-trimethyl-6-vinyl-2H-pyran-3-ol
摘要:
The asymmetric Sharpless' dihydroxylation of linalool, citronellyl acetate and nerolidol was investigated. High diastereo-. enantio- and positional selectivity was observed for the first two terpenes. A highly diastereo- and enantioselective synthesis of (3S,6S)-tetrahydro- 2,2,6-trimethyl - 6-vinyl-2H -pyran-3-ol is described.
Heteroatom-Directed Acylation of Secondary Alcohols To Assign Absolute Configuration
作者:Alexander S. Burns、Christopher C. Ross、Scott D. Rychnovsky
DOI:10.1021/acs.joc.7b03156
日期:2018.3.2
is effective for the enantioselectiveacylation and kineticresolution of benzylic secondaryalcohols. The enantioselectiveacylation has now been extended to secondaryalcohols bearing electron-withdrawing groups such as halides and other heteroatoms. The level of selectivity is modest to good and is sufficient for determining configuration using the competing enantioselective conversion method. A
作者:Timothy J. Donohoe、Peter R. Moore、Michael J. Waring、Nicholas J. Newcombe
DOI:10.1016/s0040-4039(97)01061-7
日期:1997.7
The preparation and dihydroxylation of a series of polyenes and cyclicallylicalcohols using the TMEDA/osmium tetroxide mixture is reported. Remarkably, these reagents lead to high levels of regiochemical and stereochemical control as the oxidant hydrogen-bonds to the allylicalcohol group. A mechanistic hypothesis is presented which invokes the formation of a reactive, bidentate complex between osmium