Table 4.

Substrate scope of N-sulfonyl imine 2 and N-alkylsulfonamide 3 formation.

Entry	(Aldehyde) R1	(Sulfonamide) R2	Product 2 Yield (%) 1	Product 3 Yield (%) 2
1	4-OCH3	4-CH3	2aa 61	3aa 61
2	4-CH3	4-CH3	2ba 71	3ba 60
3	H	4-CH3	2ca 67	3ca 50
4	4-Br	4-CH3	2da 54	3da 45
5	4-Cl	4-CH3	2ea 65	3ea 74
6	4-NO2	4-CH3	2fa 50	3fa 40
7	4-CN	4-CH3	2ga 52	3ga 44
8	3-CH3	4-CH3	2ha 70	3ha 33
9	2-CH3	4-CH3	2ia 60	3ia 33
10	3-OCH3	4-CH3	2ja 60	3ja 40
11	2-OCH3	4-CH3	2ka 65	3ka 40
12	3-Br	4-CH3	2la 50	3la 22
13	2-Br	4-CH3	2ma 36	3ma 30
14	4-CH3	H	2bb 69	3bb 40
15	4-Cl	H	2eb 66	3eb 70
16	2-CH3	H	2hb 60	3hb 38
17	4-CH3	4-Cl	2bc 60	3bc 40
18	4-Br	4-Cl	2dc 58	3dc 54
19	4-CH3	2-Cl	2bd 35	3bd 17
20	4-OCH3	4-NO2	2ae 34	3ae 11
21	4-Cl	4-NO2	2ee 27	3ee 21
22	4-CH3	3-NO2	2bf 25	3bf 8
23	4-CH3	2-NO2	2bg 6	3bg trace

¹ Yields are based upon ¹H-NMR integration with internal standard. ² Isolated yields.