Well I must admit that I am no ergot chemistry expert - but I think ergotamine has to be hydrolyzed in the same matter to arrive at LSA. At least ergotinine has to - and I am tempted to say that all ergot alkaloids have to be freed from different peptide ligands, as most of them differ in exactly this "peptide garbage", the remaining structure is always lysergic acid. (of course not with, for example, bromocryptine - but with all "natural" erg. alkaloids)
(BTW maybe you should read Post 412547 (https://www.thevespiary.org/talk/index.php?topic=12738.msg41254700#msg41254700)
(pHarmacist: "Synthesis of LSD from Lysergic Acid", Tryptamine Chemistry) read the docs on Rhodium's - or simply UTFSE!? "Research" is derived from "searching"... ;) )
(and, just to give you an understanding of what is considered a good yield in acid synthesis: some procedures claim something like 75% yield from LSA, but they are conducted in professional research labs, with argon atmosphere, special lighting, high vacuum equipment and so on - in a clandestine lab setting, you could more consider 10% being a good yield..)
Greetz A
Hi! Seems you are serious about "making gold from shit" (the alchimists dream :) ) - good luck! And plan everything carefully, expect all failures to happen - try to prepare worst-case-scenarios for every possible fuckup..
(and don't request a "from scratch"-writeup from currently sold medications to LSD-25 - if anyone would know about this secret, and there surely are such bees, they surely would not ruin their efforts spent in finding/optimizing "their" method by doing a writeup intended to teach unskilled chemists how to synth it - just because "every Newbee" would immediately try synthing some, the DEA would become alerted, and woosh! (insert toilet flush sound here) - no more precursor available anymore, suddenly...)
Better "keep on hiving" (simply browse through all tryptamine/lysergic related threads, and with time you will become familiar with the topic, and eventually "discover" by yourself what you're looking for..
..and maybe for the beginning, read Patent US2003013131 (http://l2.espacenet.com/dips/viewer?PN=US2003013131&CY=gb&LG=en&DB=EPD)
"pour l'inspiration" ;) , then start searching for a way to cleave the useless ligands of your "preferred" (read available) precursor - it's all there, just has to be found.
Greetz A