Proline-Catalyzed Asymmetric Addition Reaction of 9-Tosyl-3,4-dihydro-β-carboline with Ketones
作者:Takashi Itoh、Masashi Yokoya、Keiko Miyauchi、Kazuhiro Nagata、Akio Ohsawa
DOI:10.1021/ol030103x
日期:2003.11.1
[reaction: see text] 9-Tosyl-3,4-dihydro-beta-carboline (1) reacted with a ketone in the presence of (S)-proline as a catalyst to give the corresponding addition product in good yield and high enantioselectivity. In the process, a small amount of water was found to affect the stereoselectivity of the products. The system was applied to reaction of compound 1 and 3-buten-2-one to give 3,4,6,7,12,12
[反应:见正文]在(S)-脯氨酸作为催化剂的存在下,9-Tosyl-3,4-dihydro-beta-carboline(1)与酮反应,以高收率和高对映选择性得到相应的加成产物。在此过程中,发现少量水会影响产品的立体选择性。将该体系用于化合物1和3-丁烯-2-酮的反应,得到3,4,6,7,12,12b-六氢-1H-吲哚并[2,3-a]喹诺嗪-2-酮,是合成某些吲哚生物碱的通用前体。