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

• ORCHID CHEMICAL SUPPLIES LTD

  website:http://www.orchid-chem.com

  Contact:+86-571-85395792

  Address:607, North Zhongshan Road, Hangzhou 310000 China

• QINGDAO ON-BILLION INDUSTRAIL CO.,LTD

  website:http://www.obn.com.cn

  Contact:+86-15005320811 +86-532-80681989

  Address:F35 Parkson Mansion No.44-60 Zhongshan Rd.

• Shandong united-rising pharmaceutical cooperation.,ltd.

  Contact:008653187965009

  Address:171No., Jing5 Road, Shizhong District, Jinan, China

• Cerametek Materials（ShenZhen）Co., Ltd.

  Contact:+86-755-2324.2554

  Address:A3-#9, YongChuan Street, Suite 501

• Huangshi Meifeng Chemical Co.,ltd.

  Contact:+86-714-6516706

  Address:1941-4-3#,Hubin Avenue,Huangshi,Hubei,China