The dimesitylboron group in organic synthesis 8. Preparations of 1,3-diols from oxiranes
作者:Andrew Pelter、Gina Bugden、Richard Rosser
DOI:10.1016/s0040-4039(01)80862-5
日期:1985.1
Alkyldimesitylboranes, yield anions1, Mes2BCHR, that on reaction with oxiranes followed by oxidation give 1,3-diols. These anions are thus the operational equivalent of RCHOH. The scope and limitations of the new process are delineated.
prepared by an addition of aldehyde to an ethereal solution of (allyldimethylsilyl)dibromomethyllithium, with tributyltinhydride in the presence of catalytic amount of triethylborane afforded 1-oxa-2-silacycloheptane derivative selectively in good yield. On the other hand, cyclization of vinyldimethylsiloxy derivative resulted in a formation of 3-methyl-1-oxa-2-silacyclopentane. An addition of allyldiphenylsilanol
Isolation and structure of halistatin 1, and its use as an anti-tumor agent
申请人:ARIZONA BOARD OF REGENTS
公开号:EP0608108A1
公开(公告)日:1994-07-27
An intensive long-term investigation of marine organisms as sources of new anticancer drugs has led to the isolation and structural elucidation (primarily by high field NMR and mass spectrometry) of halistatin 1, a new polyether macrolide of the halipyran-type, from the Western Indian Ocean sponge Phakellia carteri. Halistatin 1 (8.8 x 10-7% yield) caused the accumulation of cells arrested in mitosis, inhibited tubulin polymerization, and inhibited the binding of radiolabeled vinblastine and GTP to tubulin.
Halistatin 1 has the following structural formula :
Provided is a method for producing an episulfide compound, the method including a step of thiating epoxy groups of (B) an epoxy compound by a reaction with (C) a thiating agent in the presence of (A) a polyhydric hydroxyl compound having two or more hydroxyl groups.
A highly bleed-alleviating ink composition including at least one colorant, an aqueous media, a linear diol, and a humectant. The main feature of the ink composition is the addition of the linear diol. When the ink composition is applied in ink-jet printing, not only is the bleeding between black ink and color ink alleviated, but also water-fastness and printing quality are improved.