A facile method for the oxidative removal of benzyl ethers: the oxidation of benzyl ethers to benzoates by ruthenium tetraoxide
作者:Paul Francis Schuda、Melissa B. Cichowicz、Martha R. Heimann
DOI:10.1016/s0040-4039(00)94286-2
日期:1983.1
A series of benzyl ethers has been prepared and their oxidation to benzoates esters by rutheniumtetraoxide has been studied. Yields for the oxidation step range from 54 to 96%.
Vitamin D.sub.2 analogs in which a cyclopentane ring is introduced into the side chain of 1.alpha.,25-dihydroxyvitamin D.sub.2 The compounds are characterized by a marked intestinal calcium transport activity while exhibiting much lower activity than 1.alpha.,25-dihydroxyvitamin D.sub.3 in their ability to mobilize calcium from bone. Because of their preferential calcemic activity, these compounds would be useful for the treatment of diseases where bone formation is desired, such as osteoporosis.
A dynamic kinetic resolution process was applied to an enantioconvergent microbial Baeyer–Villiger oxidation of benzyloxycyclopentanone, rac-1. This was achieved by combining a whole cell-based kinetic resolution and an anion exchange resin-catalysed in situ racemisation. Several resins were screened according to their capacity to catalyse the racemisation of 1. As compared to our previous results
With a goal of the total synthesis of polymaxenolide, the first hybrid marine natural product, the model studies for constructing the dihydropyran portion based on the originally proposed biosynthesis (C-C bond formation followed by dehydrative cyclization) and the synthesis of the lower portion (the C1-C3, C7-C17 portion) based on an iodide-induced Morita-Baylis-Hillman type reaction (a three-component assembly) followed by Suzuki-Miyaura cross-coupling are described. (C) 2014 Elsevier Ltd. All rights reserved.