(R)-6-Isopropyl-5-phenyl-1,2,3,6-tetrahydro-2-pyrazinone, prepared from (R)-valine and (S)-alanine, reacts with activated alkyl halides and electrophilic olefins under solid–liquid PTC conditions with K2CO3 as base, at room temperature and with high diastereoselectivity (>94%). The palladium-catalyzed allylation reaction of this alanine derivative under neutral conditions at room temperature also takes
由(R)-缬
氨酸和(S)-丙
氨酸制得的(R)-6-异丙基-5-苯基-1,2,3,6-四氢-2-
吡嗪酮在固体下与活化的烷基卤化物和亲电烯烃反应–在室温和高非对映选择性(> 94%)的条件下,以K 2 CO 3为碱的液体
PTC条件。在室温下,在中性条件下,该丙
氨酸衍
生物的
钯催化的烯丙基化反应也发生,其de> 96%。烷基化的
吡嗪酮的最终
水解得到对映体纯的α-甲基
α-氨基酸。