Table 3. Enantioselective Michael–ring-closure of TKPs 4.

Entry	TKP	Cat.	X	11 a [%]	er b
1	4a	5d	CO2Me	11a 98	87 : 13
2	4a	5d	CN	11b 99	95 : 5
3	4a	5d	SO2Ph	11c 97	97 : 3
4	4b	5d	CO2Me	11d 89	83 : 17
5	4b	5d	CN	11e 98	91 : 9
6	4b	5d	SO2Ph	11f 82	93 : 7
7	4a	5c	CN	11b 88	7 : 93 c
8	4b	5c	CN	11e 82	1 : 99 c

^aIsolated yield of single diastereomer after chromatography.

^bDetermined by HPLC analysis.

^cEnantiomeric structure to that shown.