Non-stabilized diazoalkane synthesis <i>via</i> the oxidation of free hydrazones by iodosylbenzene and application in <i>in situ</i> MIRC cyclopropanation
作者:Emmanuelle M. D. Allouche、André B. Charette
DOI:10.1039/c8sc05558k
日期:——
powerful reagents in organic synthesis, but the risks associated with their toxicity and instability often limit their uses. Herein we describe an efficient, easy-to-handle and safe batch protocol for the in situ generation and cyclopropanation of these highly reactive non-stabilized diazoalkanes through the oxidation of free hydrazones using iodosylbenzene. Numerous substituted cyclopropanes have been
A new synthesis of N-isothiocyanatoimines has been developed which involves reaction of triethylammonium 3-alkylidenedithiocarbazate with thiophosgene.
N-substituted trialkylstannylhydrocarbylcarboxylic acid hydrazides, methods of their preparation and insecticide compositions containing them
申请人:UNIROYAL, INC.
公开号:EP0006693A1
公开(公告)日:1980-01-09
Carboxylic acid hydrazides of the formula R3- SnACONR1X are useful as insecticides. Methods of preparation of these compounds and compositions containing them are also described.
Conversion of the carbonyl group to CF2 using iodine monofluoride (IF)
作者:Shlomo Rozen、Dov Zamir
DOI:10.1021/jo00015a024
日期:1991.7
A novel method for the transformation of CO --> CF2 is described. The easily made hydrazone derivatives of the carbonyl moiety are reacted under mild conditions with IF prepared directly from the corresponding elements. Various hydrazones have been examined and compared with each other. Unsubstituted ones are usually the most suitable although they are not always easy to purify and store. N-Methyl- and N,N-dimethylhydrazones also give quite satisfactory results. The more easily made dinitrophenyl hydrazones (DNPs), semicarbazones, and tosylhydrazones also react, but the yields of the desired CF2 compounds are usually lower. Oximes could also be successfully reacted. The two main byproducts of the reaction are the parent carbonyl compounds, which can be recycled, and the alpha-iododifluoro derivatives. The latter upon treatment with LiAlH4 or Bu3SnH were reduced to the desired product, thus increasing the overall yields.
Jakobsen,P., Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1975, vol. B 29, p. 281 - 284