Reversal of diastereofacial selectivity in the nucleophilic addition reaction to chiral N-sulfinimine and application to the synthesis of indrizidine 223AB
作者:Yuji Koriyama、Akihiro Nozawa、Ryuuichirou Hayakawa、Makoto Shimizu
DOI:10.1016/s0040-4020(02)01250-4
日期:2002.11
Diastereoselective addition reaction of ester enolates and Grignard reagents to optically active N-sulfinimines was examined. Reversal of the diastereofacial selectivity was realized by using appropriate metal species, solvents and additives, and the β-amino esters (up to >98% de) and the homoallylic amines (up to >98% de) were obtained in good yields. β-Amino esters thus obtained were converted to
考察了酯烯酸酯和格氏试剂对光学活性N-亚磺胺的非对映选择性加成反应。通过使用适当的金属种类,溶剂和添加剂,可以逆转非对映选择性,并以良好的收率获得了β-氨基酯(至多> 98%de)和均烯丙基胺(至多> 98%de)。由此获得的β-氨基酸酯被转化为有用的涉及(R)-高丝氨酸的β-氨基酸。还描述了在吲哚定生物碱的合成中的应用。