A Water-Soluble Ruthenium Glycosylated Porphyrin Catalyst for Carbenoid Transfer Reactions in Aqueous Media with Applications in Bioconjugation Reactions
作者:Chi-Ming Ho、Jun-Long Zhang、Cong-Ying Zhou、On-Yee Chan、Jessie Jing Yan、Fu-Yi Zhang、Jie-Sheng Huang、Chi-Ming Che
DOI:10.1021/ja9077254
日期:2010.2.17
Water-soluble [Ru(II)(4-Glc-TPP)(CO)] (1, 4-Glc-TPP = meso-tetrakis(4-(beta-D-glucosyl)phenyl)porphyrinato dianion) is an active catalyst for the following carbenoid transfer reactions in aqueous media with good selectivities and up to 100% conversions: intermolecular cyclopropanation of styrenes (up to 76% yield), intramolecular cyclopropanation of an allylic diazoacetate (68% yield), intramolecular
Rearrangement of ammonium ylides produced by intramolecular reaction of catalytically generated metal carbenoids. Part 1. Synthesis of cyclic amines
作者:Clark、Hodgson、Goldsmith、Street
DOI:10.1039/b108179a
日期:2001.12.11
Cyclic amines have been prepared in good yield by [2,3]-rearrangement of ammonium ylides produced by intramolecular reaction of copper carbenoids tethered to allylic amines. Copper(II) acetylacetonate is the optimum catalyst for carbenoid/ylide generation from the diazo ketone precursor, and reactions must be performed at elevated temperatures in order to obtain reasonable reaction rates and high yields. The reaction has been used to prepare five- to eight-membered cyclic amines. In cases where the substrate possesses a substituent on the tether connecting the diazo group to the allylic amine, tandem ylide formation and rearrangement delivers a high yield of the expected 2,5-dialkylpyrrolidinone or 2,6-dialkylpiperidinone, but low levels of diastereocontrol are obtained.Two new methods have been developed for the synthesis of diazo ketones containing a nucleophilic allylic amine substituent. The first method involves conjugate addition of allylic amines
to unsaturated diazo ketones and is high yielding but of limited scope. The alternative general sequence involving nitrogen protection, α-diazo ketone formation, deprotection and allylation can be used to prepare the substrates required for intramolecular tandem ylide formation and rearrangement.
Intramolecular generation and rearrangement of ammonium ylides from copper carbenoids: a general method for the synthesis of cyclic amines
作者:J. Stephen Clark、Paul B. Hodgson
DOI:10.1039/c39940002701
日期:——
Tandem intramolecular formation and [2,3]-sigmatropic rearrangement of ammoniumylidesfrom copper carbenoids is a general method for the preparation of cyclic amines.
由铜类铜化合物形成的串联分子内形成和铵化铵的[2,3]-σ重排是制备环胺的一般方法。
Ruthenium Porphyrin Catalyzed Tandem Sulfonium/Ammonium Ylide Formation and [2,3]-Sigmatropic Rearrangement. A Concise Synthesis of (±)-Platynecine
作者:Cong-Ying Zhou、Wing-Yiu Yu、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1021/jo049540v
日期:2004.10.1
allyl sulfides such as crotyl sulfide produced an equimolar mixture of anti- and syn-2-(ethylthio)-3-methyl-4-pentenoic acidethyl ester. The analogous “EDA + N,N-dimethylcrotylamine” reaction afforded a mixture of anti- and syn-2-(N,N-dimethylamino)-3-methyl-4-pentenoic acidethyl esters with a diastereoselectivity of 3:1. The observed catalytic activity of [RuII(TTP)(CO)] for the ylide [2,3]-sigmatropic