s 1h compound 6s can be obtained following procedures described herein 1 h nmr 400 mhz dmso d 6 u03b4 ppm 1 17 t j 7 19 hz 3h 3 34 quin j 6 67 hz 2h 7 79 d j 8 90 hz 1h 8 43 d j 8 90 hz 1h 8 64 br s 2h 8 68 t j 5 82 hz 1h 9 02 s 1h compound 6t can be obtained following procedures described herein 1 h nmr 400 mhz dmso d 6 u03b4 ppm 1 24 d j 6 65 hz 6h 4 01 dq j 13 50 6 72 hz 1h 7 78 d j 8 61 hz 1h 8 36 8 45 m 2h 8 62 d j 1 96 hz 2h 9 02 s 1h 13 16 br s 1h compound 6u can be obtained following procedures described herein 1 h nmr 400 mhz dmso d 6 u03b4 9 00 8 78 m 1h 8 74 8 38 m 1h 7 78 7 47 m 1h 7 35 d j 4 7 hz 1h 7 19 6 66 m 1h 5 70 br s 1h 3 17 3 04 m 2h 1 32 1 01 m 3h compound 6v can be obtained following procedures described.