The Claisen Rearrangement Followed by Phenol Oxidation: A Simple Route to Naturally Occurring Benzoquinones Including an Ansa-Bridged Derivative Related to the Ansamycin Antibiotics
摘要:
天然存在的苯醌类化合物primin 1和pallasone B 2,通过一个简便的方法合成,该方法包括使用微波加速的Claisen重排反应将烯丙基醚4进行转化,随后对侧链烯烃进行氢化处理,并氧化成醌;通过加入环闭合烯烃交换步骤,该方法被扩展到合成ansa桥联的苯醌11,这是一种与ansa霉素抗生素相关的结构。
The Claisen Rearrangement Followed by Phenol Oxidation: A Simple Route to Naturally Occurring Benzoquinones Including an Ansa-Bridged Derivative Related to the Ansamycin Antibiotics
摘要:
天然存在的苯醌类化合物primin 1和pallasone B 2,通过一个简便的方法合成,该方法包括使用微波加速的Claisen重排反应将烯丙基醚4进行转化,随后对侧链烯烃进行氢化处理,并氧化成醌;通过加入环闭合烯烃交换步骤,该方法被扩展到合成ansa桥联的苯醌11,这是一种与ansa霉素抗生素相关的结构。
Synthetic ansamycins prepared by a ring-expanding Claisen rearrangement. Synthesis and biological evaluation of ring and conformational analogues of the Hsp90 molecular chaperone inhibitor geldanamycin
作者:Christopher S. P. McErlean、Nicolas Proisy、Christopher J. Davis、Nicola A. Boland、Swee Y. Sharp、Kathy Boxall、Alexandra M. Z. Slawin、Paul Workman、Christopher J. Moody
DOI:10.1039/b615378j
日期:——
A series of ansa-quinones has been prepared by chemical synthesis, and evaluated by biological techniques. Thus, 19-membered ansa-lactams, simplified analogues of the naturally occurring Hsp90 molecular chaperone inhibitorgeldanamycin, were obtained by concise routes, the key steps being the combination of a ring-closing metathesis to give a 17-membered ring followed by Claisen rearrangement to effect ring expansion. The methodology was also used to prepare an “unnatural” 18-membered ring analogue. In ATPase enzyme assays, the synthetic ansa-quinones were weak inhibitors of Hsp90.
The Claisen Rearrangement Followed by Phenol Oxidation: A Simple Route to Naturally Occurring Benzoquinones Including an Ansa-Bridged Derivative Related to the Ansamycin Antibiotics
作者:Christopher J. Moody、Christopher J. Davis
DOI:10.1055/s-2002-34877
日期:——
The naturally occurring benzoquinones primin 1 and pallasone B 2 were synthesised by a simple protocol involving microwave accelerated Claisen rearrangement of allyl ethers 4, followed by hydrogenation of the side chain alkene, and oxidation to the quinone; by incorporating a ring-closing metathesis step, the method was extended to the synthesis of the ansa-bridged benzoquinone 11, a structure related to the ansamycin antibiotics.
天然存在的苯醌类化合物primin 1和pallasone B 2,通过一个简便的方法合成,该方法包括使用微波加速的Claisen重排反应将烯丙基醚4进行转化,随后对侧链烯烃进行氢化处理,并氧化成醌;通过加入环闭合烯烃交换步骤,该方法被扩展到合成ansa桥联的苯醌11,这是一种与ansa霉素抗生素相关的结构。