Efficient preparation of [(methoxymethoxy)methyl]tributylstannane, a convenient hydroxymethyl anion equivalent
作者:Carl R. Johnson、John R. Medich
DOI:10.1021/jo00252a054
日期:1988.8
Cerium ammonium nitrate: a new catalyst for regioselective protection of glycols
作者:María J. Comin、Eleonora Elhalem、Juan B. Rodriguez
DOI:10.1016/j.tet.2004.09.097
日期:2004.12
The regioselective introduction of a methoxymethyl (MOM) group on different type of glycols via an orthoester intermediate was investigated. The novelty presented in this study is the use of ceric ammonium nitrate instead of the previously employed camphorsulfonic acid as catalyst. The monoprotection reaction was revealed to be highly selective when the glycol moiety was in the presence of an ether functionality. (C) 2004 Elsevier Ltd. All rights reserved.
JOHNSON, CARL R.;MEDICH, JOHN R., J. ORG. CHEM., 53,(1988) N 17, C. 4131-4133
作者:JOHNSON, CARL R.、MEDICH, JOHN R.
DOI:——
日期:——
An alternative to the Swern oxidation
作者:Alakesh Bisai、M. Chandrasekhar、Vinod K. Singh
DOI:10.1016/s0040-4039(02)02004-x
日期:2002.11
A variety of alcohols have been oxidized under mild conditions by the DMSO–Ph3P·X2 complexes. The reaction does not produce any Pummerer product. A mechanism for the reaction is proposed.
altered the transition state. Substrate mapping analysis strongly suggested that the CH/π interaction partly enhanced the (R)-enantiomer reactivity, the estimated energy of the CH/π interaction being −0.4 kcal mol−1. The substrate scope of the I287F/I290A double mutant was broad. This biocatalyst was useful for the dynamic kineticresolution of a variety of bulky secondary alcohols for which the wild-type