Table 1.
| ||||
---|---|---|---|---|
R1 | R2 = CH2NHCOCH3 | R2 = CH(OH)CH(OH)CH2SH | R2 = CH2OH | R2 = CH2CH2CH2OH |
CH2CH(CH3)2 | 2a, 100%a | 1a, 52% | 6a, 60% | 7a, 36% |
CH(CH3)2 | 2b, 18% | 1b, 14% | 6b, 9% | 7b, 8% |
CH2CH2SCH3 | 2c, 51% | 1c, 50% | 6c, 39% | 7c, 25% |
CH2Ph | 2e, 71% | 1e, 29% | 6e, 29% | 7e, 19% |
CH2CH(CH3)CF3 | 2g, 19% | 1g, 23% | 6g, 29% | 7g, 30% |
CH2CH2N3 | 2h, 25% | 1h, 36% | 6h, 17% | 7h, 26% |
The percentages in parenthesis indicate the relative yields of thiopyrazines normalized to the yield of 2a.