Conversion of serine .beta.-lactones to chiral .alpha.-amino acids by copper-containing organolithium and organomagnesium reagents
作者:Lee D. Arnold、John C. G. Drover、John C. Vederas
DOI:10.1021/ja00249a031
日期:1987.7
Les amino-3 oxetannones-2 N-substituees et N,N-disubstituees reagissent avec des organocuprates pour donner des α-aminoacides
Les amino-3 oxetannones-2 N-substituees et N,N-dissubstituees reagissent avec des Organocuprates pour donner des α-aminoacides
New Synthetic Technology for the Synthesis of Hindered α-Diazoketones via Acyl Mesylates
作者:K. C. Nicolaou、Phil S. Baran、Yong-Li Zhong、Ha-Soon Choi、Kin Chiu Fong、Yun He、Won Hyung Yoon
DOI:10.1021/ol990790l
日期:1999.9.1
[GRAPHICS]A mild and reliable one pot protocol for the elaboration of sterically demanding carboxylic acids into alpha-diazoketones via acyl mesylates has been developed. Aside from delineating the reaction parameters which render this strategy quite general for hindered carboxylic acids, we have directly proven the existence of the fleeting acyl mesylate group as the reactive species in these reactions and shed light onto the differing mechanisms which are operative in the activation of hindered and simple carboxylic acids with methanesulfonyl chloride.
XXIX.—Studies in keto-lactol tautomerism. Part IV. Chemistry of 5-acetyl-1 : 1 : 2-trimethylcyclo-pentane-2-carboxylic acid. Observations on the constitutions of the acid esters of camphoric acid, and a synthesis of homoepicamphor