completed by reaction with a protic nucleophile for the synthesis of indenol derivatives with a tertiary center is described. Mechanistic studies and DFT calculations indicate that the transformation is initiated by a gold-promoted 5-endo-dig carbocyclization to form the key intermediate vinyl gold carbene, which is intercepted by an unprecedented vinylogous addition and followed by external protic nucleophile-assisted
Cu(OTf)2 was found to be an efficient catalyst in the acylation reaction of alcohols, phenols, amines and thiols with acetic anhydride in CH2Cl2 or acetic acid. A catalytic cycle has been proposed for the acylation reaction.
ONE-POT OXIDATION AND WITTIG OLEFINATION OF ALCOHOLS USING O-IODOXYBENZOIC ACID AND STABLE WITTIG YLIDE<sup>*</sup>
作者:Arup Maiti、J. S. Yadav
DOI:10.1081/scc-100104061
日期:2001.1
Benylic, allylic, and propargylic alcohols, as well as diols, can be oxidized with o-iodoxybenzoic acid (IBX) in the presence of stabilized Wittig ylide[1] to generate α,β-unsaturated ester in one pot. This is useful when the intermediate aldehydes are unstable and difficult to isolate. *IICT communication no. 4369.
Palladium catalysed allylic substitution via in situ activation of allylic alcohols
作者:R. Kumareswaran、Yashwant D. Vankar
DOI:10.1016/s0040-4039(97)10237-4
日期:1997.12
In-situ activation of a variety of allylic alcohols by hexachlorophosphazene (or oxalyl chloride) followed by Pd(0) catalysed reactions with lithio dimethyl malonate leads to the regio and stereoselective alkylations in god yields.
Claisen ortho ester rearrangement with trimethyl β-(methoxy)orthopropionate: a thermally stable synthon for the preparation of methyl α-substituted acrylates
作者:Stanley Raucher、James E. Macdonald、Ross F. Lawrence
DOI:10.1016/s0040-4039(00)77851-8
日期:1980.1
Trimethyl β-(methoxy)orthopropionate, a compound which is thermally stable at 190 °C for prolonged times, may be utilized as a synthon for the preparation of methyl α-substituted acrylates via Claisen ortho ester rearrangement with allylic alcohols followed by β-elimination of methanol with base.