PROCESS FOR PRODUCING OPTICALLY ACTIVE BETA-AMINO ALDEHYDE COMPOUND
申请人:Hayashi Yujiro
公开号:US20130211139A1
公开(公告)日:2013-08-15
The invention relates to a method of producing optically active β-aminoaldehyde compound (3) by reacting imine compound (1-1) or sulfone compound (1-2) with aldehyde compound (2) in the presence of an optically active pyrrolidine compound.
wherein each symbol is as defined in the specification.
Anti Mannich, try this! A direct asymmetric Mannich reaction catalyzed by a diarylprolinol silyl ether was developed to afford the anti‐Mannich product with excellent enantioselectivity. Imines derived from both aliphatic and aromatic aldehydes were successfully used to obtain the synthetically important β‐amino aldehydes (see scheme; Ts=tosyl). The reaction can also be performed in the presence of
Synthetic study on dolastatin 16: concise and scalable synthesis of two unusual amino acid units
作者:Taiki Umezawa、Akinori Sato、Yasuto Ameda、Loida O. Casalme、Fuyuhiko Matsuda
DOI:10.1016/j.tetlet.2014.11.054
日期:2015.1
A convenient and scalable synthesis of two unusual aminoacid units found in dolastatin 16, dolaphenvaline, and dolamethylleuine, is described. Dolastatin 16, which was first isolated from the sea hare Dolabella auricularia by Pettit, exhibits not only strong inhibition of growth for a variety of human cancer cell lines but also potent antifouling activity against the larvae of the barnacle Balanus
were realized in few steps, through the condensation between 5,6-diethoxy-5,6-dimethyl-1,4-dioxan-2-one and an appropriate imine, which is the key reaction to control the C2–C3 relative stereochemistry, followed by a methanolysis/ring-closure tandem reaction sequence. In particular, 2,3-trans-morpholines derive from the R*,S*-product of the acid condensation of N-functionalized alkylimines with the
Conversion of <i>N</i>-Benzyloxycarbonylamino- and <i>N</i>-Tosylamino-Benzyl Phenylsulfones by Green Strecker Reactions to α-Aminobenzyl Nitriles Using Potassium Hexacyanoferrate(II)
作者:Xiaochun Hu、Rongzhi Li、Zheng Li
DOI:10.3184/174751914x14030207593683
日期:2014.7
α-aminobenzyl nitriles has been achieved by eco-friendly Strecker reactions using potassium hexacyanoferrate(II) as a cyanide source, benzoyl chloride as a promoter, and potassium hydroxide as a base. The protocol has the advantages of using a nontoxic, nonvolatile and inexpensive cyanatingagent, employing a simple work-up procedure and producing high yields.
使用六氰基高铁酸钾 (II) 作为氰化物源,通过生态友好的 Strecker 反应实现了由 N-苄氧基羰基氨基和 N-甲苯磺基氨基-苄基苯砜原位生成的醛亚胺氰化为相应的 N-保护的 α-氨基苄基腈,苯甲酰氯作为促进剂,氢氧化钾作为碱。该协议的优点是使用无毒、非挥发性和廉价的氰化剂,采用简单的处理程序,产量高。