16033-41-3Relevant articles and documents
Improved synthesis of vitamin K1
Ji, Ya-Fei,Zong, Zhi-Min,Wei, Xian-Yong,Tu, Guang-Zhong,Xu, Li,He, Lin-Tao
, p. 763 - 772 (2007/10/03)
With (E/Z)-isomeric phytyl halides as side-chain materials, vitamin K1 is synthesized via a Diels-Alder reaction to activate the free bridgehead hydrogen of 3 for the alkylation and a retro-Diels-Alder reaction to eliminate cyclopentadiene from 2 in a high yield, in which the configuration of the double bond in the phytyl side-chain is retained.
A Convenient One-flask Synthesis of Vitamin K
Tso, Hsi-Hwa,Chen, Yu-Jiun
, p. 104 - 105 (2007/10/03)
A facile synthesis of highly pure (E)-form vitamins K1 and K2 by the reaction of 3-substituted isobenzofuranones 2 with vinylic sulfones 1 in one flask is described.
Catalytic Oxidation of Hydroquinones and Naphthalenediols to 1,4-Quinones with H2O2 in the Presence of Chromium (VI) Oxide-Bistributyltin Oxide and an Application to Vitamin K1 Synthesis
Inoue, Masami,Uragaki, Toshitaka,Enomoto, Saburo
, p. 2075 - 2078 (2007/10/02)
The oxidation of hydroquinones and naphthalenediols to 1,4-quinones was carried out in the presence of a chromium (VI) compound formed from chromium (VI) oxide and bistributyltin oxide with 30percent aqueous H2O2 in benzene-isopropyl ether at 50 deg C.The catalyst was fixed on charcoal and used for the oxidation of dihydrovitamin K1 in ethyl alcohol.