Stereoelectronic control of oxazolidine ring-opening: structural and chemical evidences
作者:Jimmy Sélambarom、Sophie Monge、Francis Carré、Jean Pierre Roque、André A Pavia
DOI:10.1016/s0040-4020(02)01287-5
日期:2002.11
Ringopening of oxazolidines derived from tris(hydroxymethyl)aminomethane, l-serine and l-threonine was investigated. It was shown that n(N)→σ∗(C–O) electron delocalization (endo-anomeric effect) occurring in the five-membered ring plays a major role in the cleavage of the intracyclic C–O bond. The present work establishes that when the nitrogen lone pair is conjugated with a carbonyl group (n(N)→π(CO)
The general and efficient synthesis of the title compounds, consisting of the (selective) replacement of chlorine in commercial α-chlorodiazines and cyanuryl chloride by the 3,7-dioxa-r-1-azabicyclo[3.3.0]oct-c-5-ylmethoxy group (Williamson method) is described. The stereochemistry of this new series of derivatives is analysed in terms of different conformational chirality exhibited in solution (1H
标题化合物的一般有效合成,包括用(3,7-二氧杂-r -1-氮杂双环[3.3.0] oct- c -5 (选择性)替代商业α-氯二嗪和氰尿酰氯中的氯描述了-甲氧基基团(Williamson方法)。分析了该新系列衍生物的立体化学,分别以溶液(1 H NMR)相对于固态(X射线衍射)相对于手性形式的中观表现出不同的构象手性。在固态下,指出了一些手性网络的包容能力以及它们的超分子聚集。c -5-di(s)的旋转异构行为之间具有良好的相关性发现处于两个状态的-三)二嗪基氧基甲基。
Alkoxy disulfides as antimicrobial agents
申请人:ROHM AND HAAS COMPANY
公开号:EP1008296A1
公开(公告)日:2000-06-14
Disclosed is a method of inhibiting the growth of microorganisms in, at, or on a locus subject to microbial attack, comprising introducing to said locus an antimicrobially effective amount of at least one alkoxy disulfide of formula:R1-CHR3-O-S-S-O-CHR4-R2 wherein:
R1, R2are independently selected from 5- or 6-membered aromatic rings, optionally substituted with up to 3 e· donating substituents of which 2 can optionally be combined to form another ring; and
R3, R4are independently selected from H, CH3, or CH2CH3.
Multiple approaches are described for the elucidation of the stereochemistry in solution (high-resolution NMR spectroscopy) and in the solid state (X-ray diffractometry) that are based on ab initio calculations (level RHF/6-31G*) of some representative 3,7-dioxa-1-azabicyclo[3.3.0]octanes. The results are presented in terms of conformational analysis, anomeric effects, chelating properties and aggregation
Antimicrobial oxazolidine/iodopropynyl-butyl carbamate composition containing less than 0.1 wt%free formaldehyde
申请人:ISP INVESTMENTS INC.
公开号:US20040152749A1
公开(公告)日:2004-08-05
This invention relates to a broad spectrum antimicrobial composition, effective against gram negative and gram positive bacteria and fungi, which comprises a synergistic composition comprising iodopropynyl butyl carbamate and a bicyclic oxazolidine containing less than 0.1% of free formaldehyde.