Cationic chiral Au(I) complexes catalyze asymmetric Pictet-Spenglerreactions between tryptamines and arylaldehydes. The resulting tetrahydro-β-carbolines are obtained with wide functional group tolerance in high yield and with high enantioselectivities (up to 95%). Aldehydes bearing polar or protic functions are well tolerated. The reaction features a hitherto unknown C2-auration of the indole as
N-Propargyl tryptamines bearing N-substituents such as propargyl, allyl, alkyl or benzyl groups undergo regioselective gold-catalyzed cyclizations to the corresponding spiroindolenines, while it was previously shown that N-sulfonyl-N-propargyl tryptamines lead to achiral azepino[4,5-b]indoles. An asymmetric approach to these spiroindolenines is disclosed using chiral gold complexes, leading to enantiomeric
Ñ -Propargyl色胺轴承ñ -取代基如炔丙基,烯丙基,烷基或苄基团经历区域选择性金催化的环化反应,以相应的spiroindolenines,而先前被显示Ñ -sulfonyl- Ñ -propargyl色胺导致的非手性氮杂并[4, 5- b ]吲哚。使用手性金络合物公开了对这些螺环吲哚胺的不对称方法,导致对映体比率高达84/16。可以使用惠斯根环化,钯催化的交叉偶联或还原将螺环吲哚啉后期官能化。计算研究表明,取决于胺上取代基的性质,反应是通过不同的机理途径进行的。