Stereospecific Synthesis of β-Lactams from Heterocyclic Imines Using the Staudinger Reaction
作者:T. Stalling、K. Johannes、S. Polina、J. Martens
DOI:10.1002/jhet.1688
日期:2013.5
The reactions of the heterocyclicimines 5,6‐dihydro‐2H‐[1,3]oxazines and 2H‐1,4‐benzothiazines with different substituted acetyl chlorides in the presence of triethylamine forming β‐lactams were examined focusing on the stereochemistry of the Staudingerreaction.
在形成三乙胺的β-内酰胺存在下,研究了杂环亚胺5,6-二氢-2 H- [1,3]恶嗪和2 H -1,4-苯并噻嗪与不同取代的乙酰氯的反应施陶丁格反应的过程。
METHOD OF STABILIZING IMINO-FUNCTIONAL SILANE
申请人:Momentive Performance Materials Inc.
公开号:US20180016287A1
公开(公告)日:2018-01-18
A method of stabilizing imino-functional silane involving adding thereto at least one Brønsted-Lowry base to inhibit, suppress or prevent the addition reactions of the imino-functional silane with itself to form a imino- and amino-functional silane and the subsequent deamination reactions to form conjugated carbon-carbon double bond-containing imino-functional silanes and stabilized imino-functional silanes containing the at least one Brønsted-Lowry base.
Novel synthesis of 2,2-dialkyl-3-dialkylamino-2,3-dihydro-1H-naphtho[2,1-b]pyrans
作者:Po-Jung Jimmy Huang、T. Stanley Cameron、Amitabh Jha
DOI:10.1016/j.tetlet.2008.10.083
日期:2009.1
(retro-aldol product). This Mannich base then disproportionates into a quinonemethideintermediate and the secondary amine is regenerated. It then forms an enamine intermediate with 2,2-dialkylacetaldehyde (another retro-aldol product). Finally, the quinonemethideintermediate undergoes electrocyclic ring closure with enamines to produce the title compounds.
由2-萘酚,仲胺和3-羟基-2,2-二烷基丙醛制备2,2-二烷基-3-二烷基氨基-2,3-二氢-1 H-萘并[ 2,1- b ]吡喃。催化量p的存在-甲苯磺酸。该一锅法反应涉及3-羟基-2,2-二烷基丙醛的逆醛醇缩合,然后由2-萘酚,仲胺和甲醛(逆醛醇产物)形成曼尼希碱中间体。然后,该曼尼希碱歧化成醌甲基化物中间体,并再生仲胺。然后,它与2,2-二烷基乙醛(另一种逆醛醇产物)形成烯胺中间体。最后,醌甲基化物中间体与烯胺经历电环闭合以产生标题化合物。
A Convenient One-Pot Synthesis of 2,2-Dialkyl-2,3-dihydro-1<i>H</i>-naphtho[2,1-<i>b</i>]pyrans
作者:Amitabh Jha、Po-Jung Huang、Chandrani Mukherjee、Nawal Paul
DOI:10.1055/s-2007-992380
日期:——
This work describes a convenient one-pot procedure for the synthesis of 2,2-disubstituted 2,3-dihydro-1H-naphtho[2,1-b]pyrans i.e. 2,2-disubstituted 1H-benzo[f]chromans} by the reaction of 2-tetralones and α,α-disubstituted β-hydroxy propionaldehydes under acidic conditions.
POLYOL-ETHER COMPOUND AND METHOD FOR PRODUCING THE SAME
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:US20160083321A1
公开(公告)日:2016-03-24
A method for producing a polyol-ether compound, wherein a compound represented by the following formula (1) is subjected to hydrogenation reduction in the presence of a hydrogenation catalyst to obtain a polyol-ether compound having a skeleton represented by the following formula (2):
wherein R
1
and R
2
, which may be the same as or different from each other, each represent a linear or branched alkyl group having 1 to 6 carbon atoms; and R
3
represents a linear or branched alkyl group having 1 to 6 carbon atoms or a hydroxymethyl group.