Efficient chemoselective deprotection of silyl ethers using catalytic 1-chloroethyl chloroformate in methanol
摘要:
Fast and chemoselective desilylation of silyl-protected alcohols was achieved using a catalytic amount of 1-chloroethyl chloroformate in methanol. With a minimal amount of 1-chloroethyl chloroformate as the source for anhydrous HCl, extremely efficient cleavage of silyl ethers of primary and secondary alcohols was accomplished, and chemoselective deprotection of one silyl ether in the presence of another silyl or other acid-labile group was possible through controlling the amount of the chloroformate and reaction time. (c) 2005 Elsevier Ltd. All rights reserved.
Catechol boron halides: mild and selective reagents for cleavage of common protecting groups
作者:Robert K. Boeckman、Joan C. Potenza
DOI:10.1016/s0040-4039(00)99058-0
日期:1985.1
Catechol boron halides (1,X=Cl, Br) cleave certain ether, ester and carbamate protecting groups under mild conditions. The scope and selectivity of these readily available reagents has been examined.
Synthesis of 5-Amino- and 4-Hydroxy-2-phenylsulfonylmethylpiperidines
作者:Nicole Langlois、Julien Massé
DOI:10.3987/com-08-s(f)37
日期:——
Suitable protected 5-amino- and 4-hydroxy-2-phenylsulfonylmethylpiperidines were synthesized from functionalized N-benzyloxycarbonylpiperidin-2-ones through the opening of lactam ring by methyl phenyl sulfone carbanion followed by reductive aminocyclization.