1150-43-2Relevant academic research and scientific papers
Biomimetic Total Syntheses of Clavine Alkaloids
Chaudhuri, Saikat,Bhunia, Subhajit,Roy, Avishek,Das, Mrinal K.,Bisai, Alakesh
, p. 288 - 291 (2018/01/17)
Biomimetic total syntheses of either enantiomers of a number of ergot alkaloids, chanoclavine I (1b), chanoclavine I aldehyde (1c), pyroclavine (1e), festuclavine (1f), pibocin A (1g), 9-deacetoxyfumigaclavine C (1h), and fumigaclavine G (1i), have been achieved from seco-agroclavine (1a). The advanced intermediate for seco-agroclavine (1a) was synthesized via a key thiourea-catalyzed intramolecular nitronate addition onto α,β-unsaturated ester.
Total Synthesis of (-)-Chanoclavine i and an Oxygen-Substituted Ergoline Derivative
Lu, Jia-Tian,Shi, Zi-Fa,Cao, Xiao-Ping
supporting information, p. 7774 - 7782 (2017/08/14)
An efficient and direct route to ergot alkaloid (-)-chanoclavine I (3) is described using the inexpensive compound (2R)-(+)-phenyloxirane (15) as a chiral pool in 13 steps with 17% overall yield. Key features of the synthesis include a palladium-catalyzed intramolecular aminoalkynylation of terminal olefin and a rhodium-catalyzed intramolecular [3 + 2] annulation. An oxygen-substituted ergoline derivative (-)-25 was also achieved by using the same strategy.
Synthetic studies directed toward ergot alkaloids, (±)-6,7-secoagroclavine, (±)-chanoclavine-1, (±)-chanoclavine-II, and (±)-agroclavine-I, by an efficient and common synthetic route
Yamada, Fumio,Makita, Yoshihiko,Somei, Masanori
, p. 599 - 620 (2008/03/12)
Novel three synthetic routes to (±)-6,7-secoagroclavine were developed from either methyl 3-(3-formylindol-4-yl)acrylate, indole-4-carbaldehyde, or 4-iodoindole-3-carbaldehyde. The total syntheses of (±)-chanoclavine-I, (±)-chanoclavine-II, and (±)-agroclavine-I were accomplished as well from the synthetic intermediates involved in the synthesis of (±)-6,7-secoagroclavine, culminating in establishing an efficient and common synthetic method for ergot alkaloids.
Simple total syntheses of (-)-ergot alkaloids and their (+)-enantiomers by a common synthesis method utilizing optical resolution
Somei, Masanori,Nakagawa, Kyoko
, p. 1263 - 1266 (2007/10/03)
The first and simple total syntheses of (-)-isochanoclavine-1 ((-)-1b), (-)-agroclavine ((-)-3), (-)-agroclavine-1 ((-)-4), and (-)-norchanoclavine-1 ((-)-5c) and their (+)-enantiomers are achieved from indole-3-carboxaldehyde (8) by a common synthesis method utilizing optical resolution. Absolute configuration of (-)-agroclavine-1 is determined to be 5R and 10S for the first time. Preparations of both enantiomers of chanoclavine-1 (1c) are also included.
Total synthesis of optically active chanoclavine-I
Yokoyama, Yuusaku,Kondo, Kazuhiro,Mitsuhashi, Masako,Murakami, Yasuoki
, p. 9309 - 9312 (2007/10/03)
The total synthesis of optically active chanoclavine-I, an ergot alkaloid, was accomplished using palladium-catalyzed intramolecular cyclization (Heck-reaction) as a key step. The conjugate ester (6) was obtained in 2 steps from optically active 4-bromotryptophan (10), and the cyclization of 6 proceeded smoothly without racemization to give the key intermediate, tricyclic tetrahydrobenz[c,d]indole derivative (7), in high yield.
Photocyclisation of Enamides. Part 35. New Total Syntheses of the Ergot Alkaloids (+/-)-Chanoclavine-I and (+/-)-isochanoclavine-I using a Fragmentation of 3-Amino Alcohols
Ninomiya, Ichiya,Habe, Naoko,Kiguchi, Toshiko,Naito, Takeaki
, p. 3275 - 3285 (2007/10/02)
A new synthetic route involving the fragmentation reaction of 3-amino alcohols for the total synthesis of 6,7-secoergoline alkaloids was developed and then successfully applied to the total syntheses of (+/-)-chanoclavine-I and (+/-)-isochanoclavine-I.
THE FIRST TOTAL SYNTHESIS OF (+/-)-CHANOCLAVINE-I ACID AND AN ALTERNATIVE TOTAL SYNTHESIS OF (+/-)-CHANOCLAVINE-I
Somei, Masanori,Mukaiyama, Harunobu,Nomura, Yoko,Nakagawa, Kyoko
, p. 1919 - 1921 (2007/10/02)
The total synthesis of (+/-)-chanoclavine-I acid was achieved for the first time.An alternative total synthesis of (+/-)-chanoclavine-I was also reported.
A NOVEL SYNTHESIS OF (+/-)-ISOCHANOCLAVINE-I
Kiguchi, Toshiko,Kuninobu, Naoko,Naito, Takeaki,Ninomiya, Ichiya
, p. 19 - 22 (2007/10/02)
Total synthesis of (+/-)-isochanoclavine-I (9) was achieved via the route involving fragmentation reaction of the 3-aminoalcohol 4.
TOTAL SYNTHESES OF (+/-)-AGROCLAVINE-I, (+/-)-6-NOR-CHANOCLAVINE-II, AND (+/-)-CHANOCLAVINE-II
Somei, Masanori,Yamada, Fumio,Makita, Yoshihiko
, p. 895 - 898 (2007/10/02)
The first total syntheses of (+/-)-6-nor-chanoclavine-II and (+/-)-chanoclavine-II are achieved.Total synthesis of (+/-)-agroclavine-I is also reported.
SHORT-STEP SYNTHESIS OF THE ERGOT ALKALOIDS, (+/-)-NORCHANOCLAVINE-I, (+/-)-CHANOCLAVINE-I, (+/-)-ISOCHANOCLAVINE-I, and (+/-)-AGROCLAVINE
Somei, Masanori,Makita, Yoshihiko,Yamada, Fumio
, p. 948 - 950 (2007/10/02)
The simple total synthesis of the ergot alkaloids, (+/-)-norchanoclavine-I, (+/-)-chanoclavine-I, (+/-)-isochanoclavine-I, and (+/-)-agroclavine was achieved by a practical and common synthesis method.A new regio-selective oxidation of the Z-methyl group of the isoprenyl system with selenium dioxide is described.Keywords - (+/-)-norchanoclavine-I; (+/-)-norisochanoclavine-I; (+/-)-chanoclavine-I; (+/-)-isochanoclavine-I; (+/-)-agroclavine; ergot alkaloid; total synthesis; common synthesis method; new oxidation
