The Syntheses of Cyclic Spermine Alkaloids: Analogues of Buchnerine and Budmunchiamine C
作者:Yi Li、Manfred Hesse
DOI:10.1002/hlca.200390033
日期:2003.2
The syntheses of two macrocyclic sperminealkaloids, analogues 1 and 2 of budmunchiamineC and buchnerine, in which N,N′-bis(2-aminoethyl)hexane-1,6-diamine (PA 262; 4) replaces spermine as polyamine backbone, were accomplished by two different methods. The first synthetic approach was based on a metal-template intramolecular amidation of tetraamino esters prepared from a Michael addition of protected
合成两个大环精胺生物碱,布孟奇胺C和布氏碱的类似物1和2,其中N,N'-双(2-氨基乙基)己烷-1,6-二胺(PA 262; 4)取代精胺作为多胺骨架,是通过两种不同的方法完成的。第一种合成方法是基于金属模板分子内酰胺化四氨基酯,该四氨基酯由分别将受保护的PA 262 10迈克尔加成至十六烷基-2-壬酸乙酯(12)和丙-2-炔酸乙酯17制备而成(参见方案4)。和5,分别)。连续迈克尔在第二种合成方法中,将乙烷-1,2-二胺添加到不饱和酯中并进行氨解以制备前体23和24(方案6)。然后通过在DMF中以Cs 2 CO 3为催化剂的磺酰胺基衍生物25和26的大环化来构建大环内酰胺。
바이오매스 유래 유지로부터 알파 올레핀을 제조하는 방법
申请人:KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY 한국화학연구원(319980077651)
公开号:KR20200077668A
公开(公告)日:2020-07-01
바이오매스 유래 유지로부터 알파 올레핀을 제조하는 방법에 관한 것으로 상기 제조방법은 바이오매스 유래 유지 내의 다양한 포화 또는 불포화 지방산을 모두 알파 올레핀으로 제조할 수 있으며 종래 문제점인 포화 지방산의 반응 미참여 또는 다중 불포화 지방산으로 인한 혼합물 생성을 해결할 수 있으므로, 바이로매스로부터 알파 올레핀을 제조하는데 유용하게 사용될 수 있다.
Synthesis and Preferred Conformations of All Regio- and Diastereoisomeric Methyl 2,3-Fluorohydroxyalkanoates
作者:Wibke S. Husstedt、Susanne Wiehle、Christian Stillig、Klaus Bergander、Stefan Grimme、Günter Haufe
DOI:10.1002/ejoc.201001224
日期:2011.1
Selective syntheses of enantiopure regio- and diastereomeric methyl 2,3-fluoro-hydroxyalkanoates via four different routes employing two types of fluorination reagents are reported. The anti- and syn-3-fluoro-2-hydroxyalkanoates 1 and 3 were prepared by treating the corresponding epoxides with Olah's reagent (Py·9HF). Cyclic sulfates prepared from the enantiomeric diols were ring-opened with TBAF to give the
METHODS OF REFINING AND PRODUCING FUEL AND SPECIALTY CHEMICALS FROM NATURAL OIL FEEDSTOCKS
申请人:Cohen Steven A.
公开号:US20130035502A1
公开(公告)日:2013-02-07
Methods are provided for refining natural oil feedstocks. The methods comprise reacting the feedstock with a low-molecular-weight olefin or mid-weight olefin in the presence of a metathesis catalyst under conditions sufficient to form a metathesized product comprising olefins and esters. In certain embodiments, the methods further comprise separating the olefins from the esters in the metathesized product. In certain embodiments, the methods further comprise transesterifying the esters in the presence of an alcohol to form a transesterified product.
METHODS OF REFINING AND PRODUCING DIBASIC ESTERS AND ACIDS FROM NATURAL OIL FEEDSTOCKS
申请人:Snead Thomas E.
公开号:US20130085288A1
公开(公告)日:2013-04-04
Methods are provided for refining natural oil feedstocks and producing dibasic esters and/or dibasic acids. The methods comprise reacting a terminal olefin with an internal olefin in the presence of a metathesis catalyst to form a dibasic ester and/or dibasic acid. In certain embodiments, the olefin esters are formed by reacting the feedstock in the presence of a metathesis catalyst under conditions sufficient to form a metathesized product comprising olefins and esters, separating the olefins from the esters in the metathesized product, and transesterifying the esters in the presence of an alcohol to form a transesterified product having olefin esters.