Ringerweiterung von 1,2-Thiazol-3(2<i>H</i>)-on-1,1-dioxiden und 3-Amino-2<i>H</i>-azirinen zu 4<i>H</i>-1,2,5-Thiadiazocin-6-on-1,1-dioxiden
作者:Annette Rahm、Anthony Linden、Beverly R. Vincent、Heinz Heimgartner、Manfred Mühlstädt、Bärbel Schulze
DOI:10.1002/hlca.19910740511
日期:1991.8.7
Ring Enlargement of 1,2-Thiazol-3(2H)-one-1,1-dioxides and 3-Amino-2H-azirines to 4H-1,2,5-Thiadiazocin-6-one-1,1-dioxides
1,2-噻唑-3(2 H)-one-1,1- dioxides和3-Amino-2 H -azirines的环扩大至4 H -1,2,5 - Thiadiazocin -6-one-1,1 -二氧化物
Crystal structures of the 1/1 adducts of diphenylcyclopropenone with 3-triphenylstannyloxy-4,5-dimethylisothiazole 1,1-dioxide and 3-triphenylstannyloxybenzisothiazole 1,1-dioxide
作者:Weng Ng Seik、V.G.Kumar Das、Yip Wai-Hing、Thomas C.W. Mak
DOI:10.1016/0022-328x(93)80424-a
日期:1993.9
Triphenyltin hydroxide condenses with 4,5-dimethylisothiazol-3(2H)-one 1,1-dioxide in the presence of one equivalent of diphenylcyclopropenone in ethanol to give (C6H5)3SnOCH3·OC6H5. In the adduct the cyclic ketone (CO = 1.245(3) Å) is linked coordinately (Sn ← O = 2.372(2) Å; Sn ← OC = 122.7(2)°C) to the Lewis acid (SnO = 2.164(2),Å). The geometry of the tin atom is trans-trigonal bipyramidal
4,5-Dialkyl-substituted 3-oxo-(2H)-isothiazole 1,1-dioxides in reactions with diazomethane
作者:L. L. Rodina、D. B. Gidon、Vs. V. Nikolaev、B. Shulze
DOI:10.1007/s10593-008-0065-x
日期:2008.4
It has been established that the interaction of diazomethane with 4,5-dialkyl-substituted 3-oxo-(2H)-isothiazole 1,1-dioxides proceeds in two stages. Initially alkylation of the sulfonimide nitrogen atom and the carbonyl group oxygen atom occurs (in a ratio of similar to 3:2), then there is a regioselective cycloaddition of diazomethane at the C=C double bond with the formation of the corresponding N-methyloxoisothiazolopyrazolines and 3-methoxyisothiazolopyrazolines.