中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
左旋去甲麻黄碱 | (1S,2R)-(+)-norphedrine | 37577-28-9 | C9H13NO | 151.208 |
—— | 2-(N-benzylamino)-1-phenyl-1-propanone | 52597-17-8 | C16H17NO | 239.317 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (+/-)-erythro-2-dibenzylamino-1-phenyl-propanol-(1) | 80993-75-5 | C23H25NO | 331.458 |
—— | benzyl[(1S,2R)-1-hydroxy-1-phenylpropan-2-yl]carbamoylazide | 1225562-05-9 | C17H18N4O2 | 310.356 |
Cyanohydrins, prepared in high optical purity from aryl aldehydes, have been converted into α- hydroxy aldehydes, β- hydroxy ketones and β- hydroxy amines without any racemization and frequently with good stereoselectivity for the erythro-diastereoisomer (>90%) at the newly introduced stereogenic centre.
Reduction of N-t-BOC-protected-N-alkyl α-aminoketones with LiEt3BH or Li(s-Bu)3BH furnishes protected syn-β-aminoalcohols with high selectivities. In contrast, removal of the BOC group followed by reduction of the aminoketone gives anti-β-aminoalcohols with variable selectivities. With aromatic ketones, selectivities are typically high while aliphatic ketones show mediocre to high selectivities depending on steric considerations.Key words: β-aminoalcohol, diastereoselective reduction.