Efficient Syntheses of 1-Arylnaphthalene Lignan Lactones and Related Compounds from Cyanohydrins
摘要:
1-Arylnaphthalene lignan lactones were synthesized in good yields from O-(tert-butyldimethylsilyl)cyanohydrins in two steps based on a conjugate addition-aldol reaction, followed by acid-catalyzed closure to form the naphthalene ring. 4-Hydroxy-1-arylnaphthalene lignan lactones were also synthesized by conjugate addition-aldol reaction, followed by aromatization-lactonization.
1-Arylnaphthalenelignans were synthesized in good yields from O-t-butyldimethylsilylcyanohydrins in two steps based on a newapproach involving a tandem conjugate addition-aldol reaction, followed by an acid-catalyzed construction of the naphthalene ring.
Process for preparing a naphthalene derivative and a synthetic
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US05003087A1
公开(公告)日:1991-03-26
A novel process for preparing a naphthalene derivative of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are a lower alkoxycarbonyl group or both may combine to form a group of the formula ##STR2## one of R.sup.3 and R.sup.4 is hydrogen atom or a lower alkoxy group and the other is a lower alkoxy group; ring A is a substituted or unsubstituted benzene ring, which is useful as a hypolipidemic agent, and a novel intermediate of the formula: ##STR3## wherein R1, R2, R3, R4 and ring A are the same as defined above.
Palladium-Catalyzed Cross-Coupling of Cyanohydrins with Aryl Bromides: Construction of Biaryl Ketones
作者:Huifang Dai、P. Andrew Evans、Jadab Majhi、Bohang Zhou、Yuxin Zhuang、Mai-Jan Tom
DOI:10.1055/a-1850-3687
日期:——
The palladium-catalyzedcross-coupling of the lithium anion of aryl tert-butyldimethylsilyl-protected cyanohydrins with arylbromides followed by in situ deprotection with fluoride ion provides a convenient and versatile approach to biaryl ketones. This protocol represents the first example of a palladium-catalyzed arylation of a cyanohydrin, which functions as an acyl anion equivalent. Hence, in contrast