名称:
Asymmetric Syntheses of the Macrocyclic Spermine Alkaloids (−)-(S)-Protoverbine, (−)-(S)-Buchnerine, and Their Naturally Occurring Congenial Alkaloids
摘要:
Asymmetric syntheses of the following 17-membered macrocyclic spermine alkaloids are presented: (-)-(S)-protoverbine (= (8S)-8-phenyl-1,5,9,13-tetraazacycloheptadecane-6-one; 1), (+)-(S)-protomethine (=(2S)-2-phenyl-1,5,9,14-tetraazabicyclo[12.3.1]octadecan-4-one; 2), (-)-(S)-buchnerine (=(8S)-8-(4-methoxyphenyl)-1,5,9,13-tetraazacycloheptadecane-6-one; 8), (+)-(S)-VeTbamethine (=(-')-(2S)-9-[(E)-phenylprop- 2-enoyl]-2-phenyl-1,5,9,14-tetraazabicyclo[12.3.1]octadecan-4-one; 4), (-)-(S)-verbacine [(E)-phenylprop-2-enoyl]-8-phenyl-1,5,9,13-tetraazacycloheptadecan-6-one; 3), (-)-(S)-verbasikrine (8S)-1-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]-8-phenyl-1,5,9,13-tetraazacycloheptadecan-6-one; 26), (S)-isoverbasikrine (=(-)-(8S)-1-[(Z)-3-(4-methoxyphenyl)prop-2-enoyl]-8-phenyl-1,5,9,13-tetraazacycloheptadecan-6-one; 25), (+)-(S)-verbamekrine (= (+)-(2S)-9-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]-2-phenyl- 1,5,9.14-tetraazabicyclo[12.3.1]octadecan-4- one; 23), and(+)-(S)-isoverbamekrine (=(+)-(2S)-9-[(Z)-3-(4-methoxyphenyl)prop-2-enoyl]-2-phenyl-1,5,9,14-tetraazabicyclo[12.3.1]octadecan-4-one; 24). Effective methods for H-1-NMR determination of the enantiomeric purity in which (S)-2-hydroxy-2-phenylacetic acid and (S)-2-acetoxy-2-phenylacetic acid are used as shift reagents for 1, 8, and related macrocyclic alkaloids are described.