反应详情

The filtrate obtained in the previous reaction containing (R)-2,2,3-trimethyl-5-(m-trimethylacetoxyphenyl)-1,3-oxazolidine (1.8 g, 6.2 mmole) in 60 ml of ether was treated with hydrogen chloride gas until the solution was no longer turbid. This mixture was then evaporated to dryness and the residue was dissovled in a small amount of ethanol and then diluted with hexane. The hydrolysis and crystallization took place in the solution to give 1.2 g of the final product, (R)-m-(trimethylacetoxy)-α-[)methylamino)methyl]benzyl alcohol hydrochloride, 70% yield. mp 128-130° C, αD25° =-36.7° (C2H5OH). ir (KBr): 3370, 2960, 2795, 2420, 1750, 1610, 1590, 1460, 1240 and 1110 cm-1. nmr (CD3COCD3. D2O): δ 7.5-6.8 (m, 4H), 5.3 (dd, 1H, J= 5 and 10Hz), 3.8 (b, 3H), 3.4 (m, 2H), 2.9 (s, 3H) and 1.4 (s, 9H) ppm.

1. customThe filtrate obtained in the previous reaction
2. customThis mixture was then evaporated to dryness
3. additiondiluted with hexane
4. customThe hydrolysis and crystallization