I_𝟐-SDS-H_𝟐O System: A highly Efficient Dual Catalytic Green System for Deprotection of Imines and in Situ Preparation of Bis(indolyl)alkanes from Indoles in Water

Table 2

Reaction of indoles with 2,3-diaza-1,3-butadienes.

Entry	2,3-diaza-1,3-butadienes 1 (a–i)	Indoles	Products 3 (a–i)	Time (h)	Yield (%) ^a
a			3a	3.5	93
b		2	3b	4.0	90
c		2	3c	3.8	91
d		2	3d	4.3	90
e		2	3e	3.2	96
f		2	3f	4.1	90
g		2	3g	4.5	90
h			3h	4.3	88
i		2a	3i	3.5	92

^aIsolated yield.