Currently, it is only legal in 7 countries: Japan, Germany, China, South Korea, Bangladesh, Pakistan, and Venezuela. It is available in India also.
Synthesis
The oxidation of 2'-chloroacetophenone (1) with selenium dioxide gives o-chlorophenylglyoxal (2). Condensation with tert-butylamine gives the imine (3). Reduction with sodium borohydride completes the synthesis of tulobuterol.[2]
References
^Horiguchi T, Kondo R, Miyazaki J, Fukumokto K, Torigoe H (2011). "Clinical evaluation of a transdermal therapeutic system of the beta2-agonist tulobuterol in patients with mild or moderate persistent bronchial asthma". Arzneimittel-Forschung. 54 (5): 280–5. doi:10.1055/s-0031-1296971. PMID15212190. S2CID9765046.