Multi-step reaction with 11 steps
1.1: NaH
2.1: 71.1 percent / (COCl)2; DMSO / CH2Cl2 / 1.17 h / -78 °C
3.1: N-Ts-4-(R)-isopropyl-1,3,2-oxazaborolidinone-5 / tetrahydrofuran; CH2Cl2 / 0.17 h / -78 °C
3.2: 67 percent / tetrahydrofuran; CH2Cl2 / 2 h
4.1: 83 percent / 2,6-lutidine / CH2Cl2 / 2 h / -50 °C
5.1: 100 percent / H2 / Pd/C / methanol / 20 °C
6.1: 96 percent / (COCl)2; DMSO / CH2Cl2 / 1 h / -78 °C
7.1: 71.1 percent / K2CO3 / methanol / 0 - 20 °C
8.1: 82 percent / TFA / CH2Cl2 / 0.33 h / 0 °C
9.1: 92 percent / aq. NaOH / tetrahydrofuran; methanol / 0 - 20 °C
10.1: 42.1 mg / BEP; DIPEA / CH2Cl2 / 14.5 h / -10 - 20 °C
11.1: 98 percent / EDCI; DMAP / CH2Cl2 / 14.5 h / 0 - 20 °C
With
2,6-dimethylpyridine; dmap; sodium hydroxide; oxalyl dichloride; hydrogen; 2-bromo-1-ethylpyridin-1-ium tetrafluoroborate; sodium hydride; potassium carbonate; dimethyl sulfoxide; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; trifluoroacetic acid; (4R)-4-iPr-3-[(p-tolyl)sulfonyl]-1,3,2-oxazaborolidin-5-one;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; dichloromethane;
2.1: Swern oxidation / 6.1: Swern oxidation;
DOI:10.1021/ol034803d