bond through hydrogen selenide (H2Se) and hypobromousacid (HOBr), which can be easily controlled at simulated physiological conditions. This novel strategy provides a circulation regulation system to modulate the sulfilimine bond in peptides and NC1 hexamers, which can offer a substantial system for further study of the physiological function of collagen IV.
Syntheses and properties of novel cyclic sulfilimines, 2-azathiabenzene derivatives.
作者:HIROSHI SHIMIZU、KAZUNORI MATSUO、TADASHI KATAOKA、MIKIO HORI
DOI:10.1248/cpb.32.4360
日期:——
Novel cyclic sulfilimines (so-called azathiabenzenes), 2-methyl-1-aza-2-thianaphthalene (7) and 9-methyl-(14a) or 9-ethyl-10-aza-9-thiaphenanthrene (14b), were synthesized in high yields by deprotonation of the corresponding azasulfonium salts (6, 13a, 13b) with base. The ylidic properties of the azathiabenzenes were revealed by spectral and chemical evidence. The azathiabenzenes (14a, 14b) were easily oxidized with potassium permanganate to yield the corresponding azathiabenzene oxides (18a, 18b). Thermolysis of 14a in refluxing xylene afforded the ring-expanded product 7H-dibenzo [d, e] [1, 3] thiazepine (21), while 14b underwent β-elimination on refluxing in xylene to give 6H-dibenzo [c, e] [1, 2] thiazine (24). Reactions of the azathiabenzene derivatives with dimethyl acetylenedicarboxylate as an electrophile are also reported.
Reactions of azathiabenzene anion with electrophiles. Formation and x-ray analysis of novel heterocyclic compounds from the reaction with carboxylic ester
作者:Hiroshi Shimizu、Koji Hamada、Michinori Ozawa、Tadashi Kataoka、Mikio Hori、Kazuhiro Kobayashi、Yukio Tada
DOI:10.1016/s0040-4039(00)92170-1
日期:1991.1
The anion (2) generated from 9-methyl-10-aza-9-thiaphenanthrene (1) reacted with carboxylic ester to give the spiro compounds (9a), (9b) via Sommelet-Hauser rearrangement, whose structures have been confirmed by an X-ray crystal structure determination of (9a).
The addition reactions between 2-methyl-1-aza-2-thianaphthalene (1) or 9-alkyl-10-aza-9-thiaphenanthrenes (2) with methylpropiolate afforded novel 1:2-adducts (3) or (4), respectively, whose structures have been confirmed by an X-ray crystal structure determination of (4a).