Catalytic asymmetric allylations of achiral and chiral aldehydes via BINOL–Zr complex
作者:Michio Kurosu、Miguel Lorca
DOI:10.1016/s0040-4039(02)00139-9
日期:2002.3
The complex generated from BINOL, Zr(OtBu)4, and 4 Å MS in toluene–pivalonitrile is very effective for catalyticasymmetricallylation of aldehydes using allyltributyltin. The reactions of achiral aldehyde under these conditions are completed within 3 h using 10–20 mol% of the complex at −20°C. The ees of homoallylic alcohols can be enhanced up to 98% via the tandem asymmetric allylation–Oppenauer
由甲苯,新戊腈中的BINOL,Zr(O t Bu)4和4ÅMS生成的络合物对于使用烯丙基三丁基锡催化醛的催化不对称烯丙基化非常有效。在20°C下,使用10–20 mol%的配合物,可在3小时内完成这些条件下的非手性醛的反应。通过串联不对称烯丙基化-Oppenauer氧化可将均丙醇的ee提高至98%。对β-烷氧基醛的这些条件的范围和局限性进行了广泛的研究。
A facile synthesis of chiral ω-allyl- and ω-n-propyllactones via asymmetric allylboration of formyl esters with B-allyldiisopinocampheylborane
作者:P.Veeraraghavan Ramachandran、Marek P. Krzeminski、M.Venkat Ram Reddy†、Herbert C. Brown
DOI:10.1016/s0957-4166(98)00477-7
日期:1999.1
Asymmetric allylboration of aldehydes containing an adjacent ester group with B-allyldiisopinocampheylborane, followed by hydrolysis and cyclization, provides the corresponding allyl substituted lactones in high yields and greater than or equal to 92% enantiomeric excess. Hydrogenation of these lactones provides the corresponding propyl substituted lactones without any loss of optical purity. (C) 1999 Elsevier Science Ltd. All rights reserved.
Total syntheses of (-)-histrionicotoxin and (-)-histrionicotoxin 235A
作者:Gilbert Stork、Kang Zhao
DOI:10.1021/ja00171a035
日期:1990.7
STORK, GILBERT;ZHAO, KANG, J. AMER. CHEM. SOC. , 112,(1990) N, C. 5875-5876