Novel syntheses of the carbapenem key intermediates, (3R,4R)-4-acetoxy 3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone and (3S,4R)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-4-carboxymethyl-2- azetidinone, from (S)-ethyl lactate

R&D Labs maybe for 127200-91-3

• Taixing Shenfeng Chemical Co., Ltd.

  Contact:+86-523-87117033, 87117666

  Address:4# Yinsanlu, Huangqiao town, Taixing, Jiangsu, China.

• jiangsu haian chemical co.,ltd.

  Contact:86-513-15851283853

  Address:No.99,Changjiang West Road,Haian County,Jiangsu Province,China

• Hangzhou Yingshanhua Pigment Chemicals Co.,Ltd.

  Contact:+86-0150-58101658

  Address:Nanyang Economic DevelopmentZong,Xiaoshan,Hangzhou,China

• KINHENG CHEMICAL(SHANGHAI)CO., LTD.

  Contact:+8621-60490170

  Address:Room401, No.28,Lane 189, Yangshupu Rd. Shanghai, China.

• Shanghai Kefu Chemical Co.,Ltd.

  Contact:+86-21-34616196

  Address:Room601-602, Xuhui Business Building, No.168, Yude Road, Shanghai