Smooth and quantitative deprotection of a wide range of acetals and ketals [Eq. (a); R, R(1)=alkyl, aryl, H] under neutral to mildly basic conditions was achieved with catalytic quantities of cerium ammonium nitrate (CAN). The reaction conditions are compatible with a variety of sensitive functional groups, and aldehydes can be liberated from acetals without being oxidized to the corresponding carboxylic
It is provided herein a benzobicycloalkane derivative, and a preparation method and use thereof. In particular, it is provided herein a compound of Formula (I), or a pharmaceutically acceptable salt, stereoisomer or solvate thereof, a preparation method, and a use thereof in preparation of drugs for treating pain.
A convenient method for the preparation of cyclic ketals and thioketals using zirconium sulfophenyl phosphonate as catalyst is described.
描述了一种使用磺基酚磷酸锆作为催化剂制备环酮和硫酮的便利方法。
Remarkably efficient deprotection of cyclic acetals and ketals
作者:Ali Ates、Arnaud Gautier、Bernard Leroy、Jean-Marc Plancher、Yannick Quesnel、István E Markó
DOI:10.1016/s0040-4039(99)00013-1
日期:1999.2
A simple and mild procedure for the efficientdeprotection of cyclic acetals and ketals, using cerium ammonium nitrate (CAN) is reported. The method tolerates a range of functional and protecting groups and is suitable for acid-labile substrates.
Evidence for oxacarbenium ion intermediates in the Lewis acid promoted cleavage of spirocyclic dioxanes
作者:Lee A. Newitt、Patrick G. Steel
DOI:10.1039/a701764b
日期:——
Studies on the Lewis acid mediated cleavage of spiro-1,3-dioxanes
indicate that this process proceeds via an oxacarbenium ion
intermediate. With the correct choice of nucleophile and Lewis acid,
high selectivities can be obtained.