directly with tert-butyl glyoxylate. The product alkene was hydrogenated and deprotected to afford pure crystalline (R)-(+)-carolinic acid, which proved inactive against Staphylococcus aureus and Escherichia coli mutant D21f2. (R)-(+)-Carolinic acid was prepared in seven steps and 59% yield from inexpensive benzyl l-lactate, the configuration of which was inverted by a Mitsunobu reaction with trifluoroacetate
摘要 (R)-(+)-卡罗琳酸由廉价的1-
乳酸苄酯经七个步骤制备,产率为59%,其构型通过与
三氟乙酸的Mitsunobu反应而反转。通过与Ph 3
PCCO的多米诺加成反应-维蒂希烯化反应,将所得的d-
乳酸苄基环化。用第二当量的该叶立德酰化产物四氢代酸,得到3-酰基亚
乙炔基电子产酸,将其直接与
乙醛酸叔丁酯烯化。将产物烯烃氢化并脱保护,得到纯净的结晶(R)-(+)-卡罗琳酸,证明对
金黄色葡萄球菌和大肠杆菌无活性 突变体D21f2。 (R)-(+)-卡罗琳酸由廉价的1-
乳酸苄酯经七个步骤制备,产率为59%,其构型通过与
三氟乙酸的Mitsunobu反应而反转。通过与Ph 3
PCCO的多米诺加成反应-维蒂希烯化反应,将所得的d-
乳酸苄基环化。用第二当量的该叶立德酰化产物四氢代酸,得到3-酰基亚
乙炔基电子产酸,将其直接与
乙醛酸叔丁酯烯化。将产物烯烃氢化并脱保护,得到纯净的结晶(R)-(+)-卡罗琳