反应详情

The method followed that described for Synthesis Example 7, but using 3β-acetoxy-17-chloro-16-formylandrosta-5,16-diene (Compound 3) (0.5 g, 1.329 mmol), 1H-tetrazole (187 mg, 1.59 mmol) and Li2CO3 (287 mg, 3.94 mmol) gave a crude product (520 mg). Flash column chromatography on elution with pet. ether/EtOAc, (5:1), gave firstly 3β-acetoxy-17-(2H-tetrazol-2-yl)-16-formylandrosta-5,16-diene (Compound 22) (92 mg, 28.2%), mp 170-172° C. (decomp.). 1H NMR (300 MHz, CDCl3): δ 1.1 (3H, s, 18-Me), 1.29 (3H, s, 19-Me), 2.04 (3H, s, 3β-OAc), 4.62 (1H, m, 3α-H), 5.42 (1H, d, J=4.2 Hz, 6-H), 8.68 (1H, s, 5'-H) and 10.46 (1H, s, 16-CHO). Analysis calculated for C23H30O3N4 : C, 67.28; H, 7.37; N, 13.65. Found: C, 67.15; H, 7.61; N, 13.45. Further elution with p. ether/EtOAc/Et3N (7:3:0.3) gave 3β-acetoxy-17-(1H-tetrazol-1-yl)-16-formylandrosta-5,16-diene (Compound 23) (146 mg, 44.6%), mp 196-198° C. (decomp.). 1H NMR (300 MHz, CDCl3): δ 1.09 (3H, s, 18-Me), 1.20 (3H, s, 19-Me), 2.04 (3H, s, 3β-OAc), 4.62 (1H, m, 3α-H), 5.43 (1H, d, J=4.8 Hz, 6-H), 8.93 (1H, s, 5'-H) and 9.92 (1H, s, 16-CHO). Analysis calculated for C23H30O3N4: C, 67.28; H, 7.37; N, 13.65. Found: C, 67.05; H, 7.65; N, 13.45.

1. customthat described for Synthesis Example 7
2. customgave a crude product (520 mg)
3. washFlash column chromatography on elution with pet. ether/EtOAc, (5:1),